Bending machine abutment guide



Feb. 8, 1949. k H. M. SHUFF 2,460,951

BENDING MACHINE ABUTMENT GUIDE Filed Feb. 25, 1944 v Patented Feb. 8, 194

UNITED STATES PATENT OFFICE BENDING MAC H INE ABUTMENT GUIDE Horace M. Shuff, TamptufiFla. I Application February 25, 1944 Serial No. 523,860 1 Claim. (01. 153 -40) This invention relates to bending machines,

particularly to such machines for bending steel" tween the guide block and the rotating bending die at all points of adjustment. This permits the operation of the machine by unskilled help and greatly reduces the time necessary to make a changeover to bend stock of a difierent" size. When once set the guide block will keep in position until again adjusted.

A further object of the invention is to provide self positioning bending dies and bending pins which are readily removable as aunit, so that when stock of a difierent size is to be bent the bending die and pin may be lifted ofi and another unit having the proper spacing slipped into place. A simple means positions and holds the unit upon the turntable.

Other objects of the invention will appear from the following description taken in conjunction with the drawing which accompanies and forms a part of this specification and throughout the several figures of which like reference characters are used to denote like parts.

In the drawings:

Figure 1 is a top plan view of a bending machine incorporating the principles of the present invention; and

Figure 2 is a sectional view taken substantially on the line 2-2 of Figure 1.

Referring to the drawings in detail, the bending machine is generally indicated by the numeral l, and comprises a work table 2 which is cut out to form a circular opening 3 located approximately centrally of the table. Seated in the opening 3 is a turntable 4 mounted upon a shaft 5 designed to be rotated by any conventional means (not shown).

The shaft 5 extends above the turntable 4 to receive a bending arm I and a circular forming die 6. The bending aim is provided with openings near its outer end, into one of which a screw 8 is placed and threaded into an opening in the turntable 4, so that the arm will be. fixed relative to the turntable and rotate therewith. Into the other opening in the bending arm a bending pin 9 is positioned, the periphery of the bending pin being spaced from the periphery of the forming die 6 the diameter of the stock to be bent; It is contemplated that a number of bending arms'will be provided with each machine, the bending pins-being spacedatfvarying distances irom the center of the opening in the arm. which surrounds'ithe central driveshaft.

Thef-proper "arm:- for-the particular. job to be done is selected and positioned upon' the turntable before the jobisbommehcedq In opera,-

and; bend the'rod about the forming die.

To ,hO1d"th8 I'-O-d against movement during the bending operation, an abutment i0 isprovided,

adjustable toward and" awayfrom" the forming dieradially to" the axis ofthe shaft' S 'and' the forming die.

The abutment comprises a base plate ll having a plurality of slots 12 extending angularly inward from opposite edges of the plate. The shanks of bolts i3 pass through these slots, and nuts 14 are tightened to hold the plate in position. The heads of the bolts are held in slots l5 which run parallel to one another completely across the table 2. The slots l2 in the plate H are so disposed that the plate will be held upon the table at an angle with the longitudinal center line of the plate radial to the forming die. Centrally located upon the plate is a guide Hi slidingly receiving the abutment proper I1. A screw-threaded rod I8 is attached to the outer end of the abutment H and passes through a theraded opening in the guide housing It. A handle 20 is provided whereby the rod may be turned and the abutment advanced toward, or backed away from the forming die. A roller 2! is carried at the forward end of the abutment I! to contact the rod 22 to be bent to reduce friction between the abutment and the rod.

The angular relationship of the abutment to the forming die is of the utmost importance. When properly set even the most unskilled operator can properly adjust the abutment when the size of the stock to be bent is changed, The slots l2 are correctly cut into the plate H so that when the slots surround the bolts 13 the plate automatically assumes the proper angle. To obtain the proper position for the abutment, the plateis moved transversely of the table, the bolts sliding in the slotted guideways 15, until the extended longitudinal axis of the abutment coincides with a radius of the forming die. The nuts 14 are then tightened to clamp the plate in position. Once this adjustment is made the plate is fixed and need not be again moved. All adjustment is thereafter made simply by manipulating the screw I8. The angle of the plate and abutment is preferably 45 to a line drawn transversely across the work table parallel to the front and back edges, and when the abutment is properly adjusted the point of contact between the abutment and the stock to be bent will be half the diameter of the forming die plus the diameter of the stock in back of the axis of the forming die and a likedistance to one side. As the abutment moves radially to the forming die, this ratio to dius extending to the initial point of bending of the rear and to the side will be maintained in all positions of adjustment.

By having the abutment contact the stock off to one side of the forming die, the stock is held much more rigidly than if the contact were made at the bending point as has been formerly done 7 in devices having simplified adjusting means.

Various changes from the precise embodiment disclosed will readily suggest themselves to those skilled in the art to which this invention appertains, all within the scope of the claim.

What I claim is A rod bending machine including a work table, a turntable within the work table, a bending die and a bending pin carried by and rotatable with said turntable, an abutment for abutting a side portion of a rod to be bent, a base plate having guiding means supported thereon for slida-bly mounting said abutment, opposite edge portions of said base plate having slots extending inwardly from the edges, said work table having on its surface a plurality of slots in spaced parallel relationship and parallel to the direction of initial movement of the rod to be bent, a plurality of bolts whose heads are slidable in said last menthe;- rod on said bending die so that the distance between such initial point of bending and the rod contacting point of said abutment will bear a substantially constant ratio to the diameter of rod for varying rod diameters.

HORACE M. SHUFF.

REFERENCES CITED The following references are of record in the ime of this patent:

UNITED STATES PATENTS FOREIGN PATENTS Country Date Great Britain Feb, 13, 1915 Great Britain 1 Apr. 13, 1908 Number 375,512 543,769 957,199 1214 551 1,261,559 Mors -1 Number 

